Wikimedia Commons/Stewie Family Guy TV Stewie Griffin gets his own show! Seth MacFarlane voices the evil genius in a new Family Guy spinoff series, premiering 2027-28 on Fox. March 13, 2026 AceShowbiz - Nearly twenty years after the debut of the first spinoff, Fox has greenlit a new animated series centered on the youngest Griffin, Family Guy's Stewie. The network has committed to a two-season run for Stewie, which is scheduled to premiere during the 2027-28 television season.